Renewable energies

Solar energy

On Earth, solar energy is at the origin of the cycle of water, wind and photosynthesis carried out by the plant kingdom, on which the animal kingdom depends via the food chains. Solar energy is therefore at the origin of all energies on Earth except nuclear, geothermal and tidal energy.

There are several ways to capture solar energy:

Wind energy

Wind energy is wind energy and more specifically, energy directly derived from the wind by means of a wind generator device such as a wind turbine or windmill. The technology currently most commonly used to capture wind energy uses a propeller on a horizontal axis.

There are mainly 4 types of wind power plants :


In the field of energy, and more particularly bioenergy, the term biomass refers to all organic matter of plant origin (including algae), animal or fungal matter that can become a source of energy by combustion (e.g. wood energy), after methanisation (biogas) or after new chemical transformations (agrofuel).

We thus distinguish the 3 different uses of biomass:


Hydroelectric energy, or hydroelectricity, is a renewable electrical energy obtained by converting hydraulic energy, from the various natural water flows, into electricity. The kinetic energy of the water flow is transformed into mechanical energy by a turbine, then into electrical energy by an alternator.

There are mainly 2 types of hydroelectric power plants:


Biogas is defined as gaseous effluents, mainly methane, resulting from the fermentation of organic matter contained in landfills, sewage treatment plants, etc. Methane is a powerful greenhouse gas and its capture is highly desirable. It can be considered as an energy resource, often via its combustion to produce steam and/or electricity; its direct use in poor gas engines can also be considered. Biogas is a combustible gas, composed on average of 65% methane (CH4) and 35% CO2.